Measurement apparatus

Abstract

A measurement apparatus mounted to a vehicle includes a light emitting unit, at least one light receiving element, a measurement unit, a monitor circuit, and an adjustment unit. An adjustment unit adjusts the sensitivity of the at least one light receiving element, based on a monitor signal generated by the monitor circuit based on a light reception signal from the at least one light receiving element having received reference light.

1 . A measurement apparatus mounted to a vehicle, the measurement apparatus comprising:
 a light emitting unit configured to radiate pulsed light;   at least one light receiving element configured to output a light reception signal corresponding to an amount of light received at a preset sensitivity, and to receive reflected light of the pulsed light radiated by the light emitting unit;   a measurement unit configured to measure an object based on the light reception signal output from the at least one light receiving element having received the reflected light;   a monitor circuit configured to generate a monitor signal indicating the amount of light received by the at least one light receiving element based on the light reception signal output from the at least one light receiving element; and   an adjustment unit configured to adjust the sensitivity of the at least one light receiving element, based on the monitor signal generated by the monitor circuit based on the light reception signal from the at least one light receiving element having received reference light with an intensity fixed to a preset level.   
     
     
         2 . The measurement apparatus according to  claim 1 , further comprising:
 a detection unit configured to detect, based on the monitor signal, a noise component contained in the light reception signal.   
     
     
         3 . The measurement apparatus according to  claim 1 , wherein
 the at least one light receiving element includes a plurality of light receiving elements.   
     
     
         4 . The measurement apparatus according to  claim 2 , wherein
 the at least one light receiving element includes a plurality of light receiving elements.